sheath knife

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun A knife that has a fixed blade and fits into a sheath.

from The Century Dictionary.

• noun A knife worn in a sheath attached to the waist-belt, as by merchant seamen and by riggers.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun A knife with a fixed blade that fits in a sheath to protect the knife and its owner.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun a knife with a fixed blade that is carried in a sheath